Power Factor Controllers There are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off-line power converter applications.
These integrated circuits feature an internal startup timer for stand-alone applications, a one quadrant multiplier for near unity power factor, zero current detector to ensure critical conduction operation, transconductance error amplifier, quick start circuit for enhanced startup, trimmed internal bandgap reference, current sensing comparator, and a totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of an overvoltage comparator to eliminate runaway out...

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